I have the Bridgestone Dueler H/L's on mine. Currently have about 10k miles on them and they still look brand new to my untrained eye. I have rotated them two times so far.
FWIW, my buddy manages a tire shop and he told me they are the best tires he has ever sold in terms of tread life. He said his customers regulary get 60k + miles out of a set without ever rotating them.
Only time will tell.
I got 18k out of the good years until they became street slicksI know this is a pretty vague question, but on average how many miles have you guys been getting on your factory tires before needing to replace with new ones?